ramé-hart precision contact angle goniometers and tensiometers are backed by nearly 50 years of experience and reputation. ramé-hart was the first company in the world to manufacture a contact angle goniometer based on the NRL design of Dr. William Zisman. Today nearly five of decades of experience are bundled in each contact angle goniometer and tensiometer. ramé-hart only makes surface science tools for measuring contact angle and surface tension. That is our sole focus. Our machinists and instrument technicians hand build and assemble each unit to rigid specifications. No goniometer system will ship from our facility until it has been thoroughly tested and calibrated and every component is in proper working order. ramé-hart is the world-wide leader in surface science instruments and contact angle goniometers.
Please refer to the matrix below to better understand the differences between the various goniometer and goniometer / tensiometer (G/T) instruments.
Note that all current goniometer models ship with a microsyringe fixture (p/n 100-10) and microsyringe assembly (p/n 100-10-20) for manual dispensing. A wide variety of needles are available. See our chart here: www.ramehart.com/pdf/needles.pdf. The optional software-driven Automated Dispensing System is supported on Models 200 and up.
In surface science, an instrument called a contact angle goniometer is used to measure static contact angle, advancing and receding contact angle, and in some cases, surface energy. The root goni refers to "angle" while meter refers to measuring device. Thus a goniometer is a measuring device for angles. While the term has been used to describe a tool used by physical therapists and also for measuring other types of angles, the traditional and more prominent use of the word "goniometer" has been to describe a contact angle meter. Note that while all of our instruments are goniometers, Models 190 and 200 are goniometer instruments only (not goniometer / tensiometer).
A goniometer /
tensiometer is an instrument that can measure both contact angle as well
as surface tension and interfacial tension. Models 250, 260, 295, 500, and
590 are all goniometer / tensiometer instruments. All of these models ship with
DROPimage Advanced software. This
powerful program calculates surface and interfacial tension using a
standard PC. The method used is based on the Young-Laplace equation and
the program has been designed to handle pendant, inverted pendant,
sessile, and captive bubble drops. DROPimage Advanced is methods-based
allowing full control over every aspect of the experiment allowing for
sophisticated dynamic and time-dependant studies. Results include
surface tension, interfacial tension, contact angle, surface energies of
solids, drop dimensions, volume and surface area, as well as surface
dilatational elasticity and viscosity. Full control over the Automated
Dispensing System and the Automated Tilting Base accessories is
integrated into the software allowing them to be controlled via discrete
controls or via a methods-based experiment. The Automated Dispensing
System and the Automated Tilting Base are included with Model 290, 295 and
are sold separately with all other models including Model 250, 260 and 500.
DROPimage Advanced has all of the surface energy tools included with